The office of the presidency was established by article of the constitution.

Article II

Explanation:

The article II of the constitution specifically address the definition of the office along with the list of duties that are expected to be carried by whoever sit in the presidential office.

Those duties include things such as taking an oath to protect the country and its interest, creating laws that benefit the people, and faithfully execute those laws with the helps of other government officials.

answer; collective security;